If you choose to undertake maintenance on your own Jawa 125 Dandy then it will always be a good plan to have access to a Workshop Manual to use as personal reference in case you want to know the way to take off a particular part for example the Wheel Bearing and install it again safely.
Jawa 125 Dandy Workshop Manuals can provide targeted diagnostic details for your vehicle therefore if something is broken it will help you determine what the issue is and the best way to resolve it. After that you can decide if you can do this by yourself or if ever the job is just too big you can actually book your 125 Dandy right into a trusted garage.
Jawa 125 Dandy manual